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  • Title: Inflammatory status and its relationships with different patterns of postpartum luteal activity and reproductive performance in early lactating Holstein cows.
    Author: Sina M, Dirandeh E, Deldar H, Shohreh B.
    Journal: Theriogenology; 2018 Mar 01; 108():262-268. PubMed ID: 29258043.
    Abstract:
    This study was undertaken to determine the effect of inflammatory status on different patterns of postpartum luteal activity and reproductive performance of Holstein cows during early lactation. The cows (n = 75) averaged 3.4 ± 1.2 (mean ± SEM) in parity and 3.1 ± 0.2 (mean ± SEM) in body condition score at calving. Transrectal ultrasonography was performed twice weekly from day 10-60 postpartum to consider ovarian dynamics. Plasma concentrations of progesterone (P4) and estradiol (E2) were measured twice weekly and plasma levels of tumor necrosis factor alpha (TNF-α) and lipopolysacchride binding protein (LBP) were measured weekly (week 3-6 postpartum). Based on plasma P4 and E2 results, 34 (45.3%) cows had normal luteal activity (NLA), whereas 19 (25.3%), 12 (16.0%), 7 (9.3%) and 3 (4.0%) cows had prolonged luteal phase (PLP), delayed first ovulation (DO), anovulation (AO) and short luteal phase (SLP), respectively. Plasma TNF-α and LBP concentrations were affected by postpartum luteal activity (NLA, SLP and PLP), ovulatory status (DO and AO) and number of weeks postpartum (P < .05). These concentrations were greater in cows with PLP (P < .05) as compared to NLA cows, and in cows that had delayed ovulation or anovulation compared to ovulated cows (P < .05). Cows with PLP had greater open days and lower conception rate as compared to NLA cows (P < .05). Healthy cows had a larger CL and greater plasma estradiol and progesterone concentrations at first and second cycle postpartum compared to inflamed cows and followed it with greater fertility (P < .05). In conclusion, inflammatory statuses were different in high-producing dairy cows showing PLP, AO and DO in comparison with the postpartum normal luteal activity (NLA) cows that influenced reproduction outcomes.
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